An advertiser is the owner of the advertising you display on your website(s). Creating an advertiser in the OpenX user interface is the first step you should take. Following this, you'll be able to create campaigns to which you can attach banners.
Go to Inventory > Advertisers:

Select Add new advertiser from the Actions box in the top right-hand corner of the screen. You are now in the Add new advertiser screen.
First, enter your advertiser's basic information:

In the Advertiser report section, select if and when to send emails to the advertiser:

The Miscellaneous section allows you to limit the delivery of ads for this advertiser:
See also: About users for information about linking a user to an advertiser account.
Note: You can change the above details at any time by clicking on the name of any advertiser and then viewing the above information in the Advertiser Properties tab.
The Advertiser Properties tab contains the same fields as the Add new advertiser page. You can alter these details at any time. When working on this page, don't forget to click the Save Changes button when you're done.
Trackers allow you to monitor conversions instigated by a visitor to your website(s) clicking on an ad. Conversions are most commonly measured as sales, leads or signups. From the Advertiser screen click on the Trackers tab:
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You will now see a list of campaigns (and linked campaigns) to which you have added trackers. The Actions box gives you the option to Add new tracker or Add new campaign. Alternatively, you can click on any listed campaign to review and adjust your Tracker Properties.
The Add new tracker and Tracker Properties tabs are identical. Within them you can enter information or make adjustments to the Tracker Information form:
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The Tracker Properties tab contains the same fields as the Add new tracker screen. This information can be edited at any time. Don't forget to click Save Changes when you're done.
The Linked Campaigns screen displays all of the campaigns linked by your trackers:
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The status of your campaigns is displayed, and the Conversion window shows their respective View and Click settings [see Linked Trackers].
The Variables tab allows you to log information that is unique to a specific conversion. First of all, select your tracker type:
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This selection configures the way that data is passed from the page and into the conversion. The options in the dropdown are:
Next, you have the option to add one or more variables:
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The available fields are:
Once you are happy with your variables, hit Save changes.
It is possible to append any HTML code to a tracker beacon. The HTML entered here will be displayed to the user when this tracker beacon is displayed. It is possible to append multiple HTML blocks to a tracker beacon (these HTML blocks can be selectively enabled). The HTML blocks will be delivered in the order specified here.
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Note: the appended code above can only be delivered when using the JavaScript tracker.
Here is where you can collect the correct type of invocation code for your advertiser's banners. Select Image Tag or JavaScript Tag from the dropdown and copy and paste the code that appears in the Trackercode box into your website's source code:
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You can assign other users permissions relevant to an individual advertiser:

These permissions include creating new accounts; modifying banners; activating and deactivating banners and accessing the audit trail.
Fill in the new user's details and click Add user when you're done.