The ADD or| PLACE button (name varies with Videopad version) will appear after selecting (left-clicking) a clip in the bin.
Drag the cursor to the start of the desired portion of the clip and click SET START. Drag to the end of the part desired and click SET END.
Now click the ADD or PLACE button and that section of the clip will appear on the sequence.
Record_2022_08_28_09_59_54_497.mp4
Drag a clip from the bin to the sequence. The bin (top-left) is where imported clips are shown under tabs like VideoFiles, AudioFiles, Images, etc.
Or right-click a bin clip to see common placement options.
The same options are shown when the chevron to the right of ADD | PLACE button is clicked. 