[cypher]

Hi & welcome to HC Sophia

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The best way to potty train your ham is wait until you find their pee corner then if possible put a litter tray there (use chinchilla sand, not dust, in the tray as the litter pellets sold are unsafe) then put some peed on substrate on top.
If you want your ham to pee in a different place if they're peeing in the house for example then put the tray close by & do the same thing.