Drag the icon directly on the preview to move it; scroll the mouse wheel over it to resize. Clip to frame trims everything that sticks out past the diamond's painted edge. Eraser: switch it on, then paint over the icon in the preview to erase parts manually (mouse wheel = brush size). Remove BG erases the background connected to the image edges (slider = tolerance). Same-colored details inside the subject are kept, and edges are automatically feathered and de-haloed. B/W stencil turns the remaining pixels into pure white art on transparency (slider = brightness cutoff) — use it to make colorful images perk-ready.
Select text, then use the buttons above — exactly like a normal text editor. Colors follow the official perk palette.