Do you mean just standing up against the furniture? or climbing up on it?

If you mean he's standing up holding on and won't sit back down, perhaps hold both his hands, you know, like when you walk them along, and perhaps help him to sit down from there so he gets the feeling of lowering himself? I don't really know if that would work.. just a suggestion. Or perhaps get him to climb up to your knees when you're sitting on the lounge and then help him lower himself off of you (did that make sense?)

If you mean he's climbing up on the furniture and can't get back down, I would show him how to climb down myself, backwards so he can see how it's done, then he might work it out for himself.

Dunno if that's useful at all, sorry hehe. I'm sure he'll get his confidence up the more he's on the move tho, he won't be like this forever