How to prioritize User Stories and Bugs?
Drag and drop prioritization is available on Kanban Board starting from TargetProcess v.2.22.6
Drag and drop prioritization is available on Kanban Board for User Stories and Bugs. You can reorder User Stories and Bugs in the Backlog, Planned and in other states.
Just drag a User Story and move it where you want it to go. A placeholder marking a new slot for this User Story will come up.

You can not reorder User Stories and Bugs in the Done state.
If you want to reorder user stories, and there’s a scroll bar in the column, two blocks with arrows will appear: one at the top of the column, and the other one — at the bottom. Move your User Story over these blocks to scroll up and down.
Make sure your User Stories are sorted by Rank as you prioritize them in your Backlog.
