My puppy's 5 months old and he cocks his leg everywhere up everything, up people, walls, doorways you name it he "marks" it, how can I stop him?

This morning he wee'd up me and I was so horrified I put him outside and shut the door but I don't think he had any idea what he'd done wrong

I am using the "positive interruptor" technique suggested in discussion thread of one of VS's programmes - Marking Indoors - Can R+ only suffice? the link Pawsitive provided is nice one YouTube - ‪How to stop unwanted behavior- the positive interrupter- dog training clicker training‬‏

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For eager & reliable recall, be fun for the dog to come back to! Then often send them off right away to do what they wanted!
DT&B - Glossary of acronyms & jargon terms.
Encouraging good behaviours, whilst consistently avoiding practise of bad alternatives leads to extinction of the bad. So if dog sits 6/10 times it doesn't sit 4/10 times, encouraging with the right rewards (positively-reinforcing) enough for 9/10 times means it now fails to sit only 1/10 times, sit 10/10 means...