I don't remember how I created my kanji schedules, so I need your advice on how to create them. Below is the extremely vague and useless explanation form the FAQ:
How do I make a schedule?
On your dashboard, there is a "Manage your schedules" link below your current schedules. This allows you to choose as little or as much from the lists available on renshuu to add to your schedule. You can also directly add or import individual terms.
As you can see below from my board, I can create grammar and sentences schedules, but not a kanji one! There is option to duplicate the existing kanji schedules (via "Manage your schedules") , but it is not the convenient way.
After you click "Manage your schedules", click on "All Schedules". From here you can either find and make a pre-made kanji schedule, or you can click "Make my own" and make an empty one to fill with whatever material you want.