Hi @Srinija_N
First step is to assign tasks to the Agile team, these tasks start appearing in the backlog section of the team.
Then you have to create iterations for the Agile team by going to hamburger menu > teams > select the agile team > Iterations.
Once iterations are created, click on the tasks in the backlog or in their respective projects and add them to iterations based on the start and end date of your iteration. this post should be helpful - https://experienceleague.adobe.com/en/docs/workfront/using/agile/scrum/iterations/add-stories-to-exi...
In essence, you need to think of it as a funnel where assignments to this agile team go to the backlog then get assigned to a sprint (iteration) based on their priority. Best practice is to keep your sprint duration to two weeks and create them as iterations in Workfront for the entirety of your engagement.
Hope this helps, happy to answer any further questions.