There is two way to setup/edit a custom cap for a specific offer for a specific affiliate. The cap can be setup via the offer itself or via the custom Settings shortcut
A - Via the Offer
1 - Go to Offers => Manager and search/click on the offer you want to setup a custom cap for a specific Publisher.
2 - On the offer card, click on the "Custom Settings" Tab
3 - On the next screen, click on add to add a conversion cap for that offer and a specific affiliate.
4 - Once done, click on "Add"
5 - You can also Edit a exciting custom cap, by searching for the current affiliate with that cap and by clicking on the 3 dots
B - Via the Custom Settings shortcut
1 - From the Offers Everflow main menu, click on "Custom Settings"
2 - On the next windows, click on the Caps Tab.
3 - From this windows you can edit or create new custom caps. Follow the same instruction as A 3 to 5.