GBC: Pokemon Trading Card Game; Modifying Decks

Well, as the title implies, I'm having trouble editing my deck in the Poke'mon Trading Card Game Video Game for the GBC. The part I can't figure out is removing/switching cards in the decklist.Any help is greatly appreciated,Thanks

I haven't played that in about 5 months, You should be able to do it through the computer in every gym... I really forgot Dx Try searching a walkthrough of it on youtube and view on how the person changes it?

Alright, I'll try it, Thanks alot.