Here is the guide for How to create a campaign

During the campaign creation process, advertiser can save the campaign details by saving campaign as Draft. Just click on "Save As Draft" button from left-top or bottom-right of the page.

Subsequently, you can keep saving the draft version after adding details. To edit details in draft campaign. Go to Dashboard -> Realtime -> 

From the Campaign table, click on Draft tab to see list of campaigns under draft status, from action, click Edit to edit any drafted campaign further. Save the drafted campaign by clicking on "Save". Or advertiser can directly run the campaign if all the details are provided. 

Read more:
How do I duplicate a campaign?
How do I extend the end date of a campaign?

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