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SoundFX comes with plenty of editing functions (probably many more than in other software). Please keep in mind that these are destructive operations. That means you directly edit the sample - there will be no new buffer with the result and you can't take edits back. Better save the sample more often to disk. To select a range for processing, just click the starting point and move the mouse to the ending point while keeping the mouse-button pressed. While selecting, the range will be highlighted and the positions as well as the length can be seen in the statusbar. You can fine-tune the selection with the function from the range-toolbar.

These functions are available (every button is followed by a menu) :

button	description
1	cut - cut selection into copybuffer
2	copy - copy selection into copybuffer
3	paste - paste contents of copybuffer
4	erase - erase selection
5	grab - generate a new buffer containing the selection
6	zero - set selection to zero (absolute silence)
7	overwrite - overwrite with contents of copybuffer