Let's say I search for "model" in my file while using phpEd. The program only allows me to find the first word "model". That doesn't make sence. In other programs, when you keep pressing search it searches the next word in the document... I should be able to find all occurences of a word "model" in a document. Any help with this? I may have misconfigured something?

I press ctrl+F to find text in a file, then F3 for next occurrence and shift+F3 for previous occurrence.

If you want to list all occurrences of a string in a file, you can locate it in workspace then right-click it and choose Search In File(s) then search for a string; the Search Results panel will then show.

It would be a nice feature enhancement though to have a checkbox on the ctrl+F search dialog for 'List lines containing string' which outputs to the Search Results. It does the same thing as the Search In Files(s), but it saves a few steps.

If it should work like Find In files, why not to use Find In files?
BTW if you want to see all occurences, just click HIGHLIGHT button in Find dialog.