Hi richard, If you have already created your game you can go to Roll20.net, click the name of your game, click the settings button, then click Game Settings. Then you can change your character sheet to another sheet. Warning: any existing characters/monsters will not be converted to 3.5. You will have to make them again in their 3.5 incarnations. If you have not finished creating your game you can simply set the sheet to your desired sheet. But, if using a Marketplace adventure the same warning applies.