Tolerances when installing toilet
Install the wax ring pressing firmly all the way around the toilet. Use your level again. You can add wedges on one side by sliding them in gently. I would use more than one for stability. Don't slide them in too far or you will break the wax seal. Once you get them where you need them, tighten up the floor bolts. To finish, cut the excess from the wedges and caulk around the base.