32 th notes and dotted 1/8th notes

Sixteenth notes are entered just like any other type of note: first select the duration (either by clicking the sixteenth note icon or by typing the shortcut, 3) then enter the pitch (either by clicking in the staff or by typng the letter name).

Alternatively, if you have lots of them you can just enter them all as eighth notes and then click on the first eighth note and press . to make it dotted (extended by half) which causes the following eighth note to be shortened to a sixteenth. You can then quickly use the arrow keys to move along from note to note and press . when you reach the ones to be dotted. Press [Ctrl]-z if you make a mistake and it will undo the last action.