I'll give you a few explanation.
• Download PokeScript 1.00 or ScriptEd.
• Extract all files to a specific folder, in your case, PokeScript should have a folder called Poket Script, atleast I think.
• Download PkmnAdv for Pokescript.
• Install it into the PokeScript folder.
• Now a log should come up automatically with pokescript saying stuff like:
Registered poke.txt
Registered move.txt
and so on..
• When saving scripts, save them as <nameofscript>.rbc, insert a name for the script before the .rbc
• Right click on the script, and click 'Compile Script'
• A log should show up and register all commands, and then BufRite should appear, check to see that all pointers are there, then click the notebook, load the Rom.
• Click the first offset and right it down on a paper.
• Click the asign button, and then another box should appear.
• Click file -> burn, make sure the first offset is the same.
• Load A-Map and go to the person or script, and write in the offset in the right box.
Hopefully that explains it?