Let's take a Dungeon team for example, go to your dungeon of choice:

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I went with FK25. As you can see there is a Team Setup button to the left, when it's blue you'll know it's active. Click on it to set up initially, though.

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This is what it'll look like on the page. If you say, wanted to use only your champions A1 every round you would then go round by round, setting the A2, A3, etc. to don't use. 

Hopefully that helps, let me know if you have any other questions. 

When on the screen where we are picking the champions to take into the fight there's a 'Team Setup' button. 

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When you click on it, there will be team slots. Click on one such slot and then on champions and they will be added to the fields and then on the highlighted button in the next pic

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In the next screen you can click though the champions and set up priorities for each skill. Be default the 'default' option for each skill is picked, but you can un-click it and then pick the option you need. 

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P.S. don't judge the team, people 👀😂

Well, I seem to be too slow today 🥲

It is just what I was looking for, thanks a lot! Actually I got Ruffstone, and it was recommended to let him fight only with the first skill (attack all) and suppress the other ones in fighting with spider. But I didn't know how to do that :).

You're great!