So, hi all.
How can I edit the regular triggers, and add some new triggers, in the melee-triggers-template?
Also, is there a way that I can use locations there, too?
Thanks in advance.

Yes. Write your triggers in StarEdit (or PyTRIG), export them, strip the header (ask around for how to do this, I can't remember), and add it to your MPQ as melee.trg (I think; you can find out for sure by looking in the MPQ for a file with "melee" in the name).

For locations, you have to use LocUnlock. Look under Modding Discussion.

Or you can use PyTRG. Write your triggers, then click "Save *.got compatable [sic] *.trg file". Add the resulting .trg file to the MPQ or EXE as scripts\melee.trg.

p_q, fix the spelling. It's "compatible", not "compatable".