Posting a pic here's easy....
In the same way you replied to the message in the thread....
Go down a wee bit it says Additional Options, press that and then Add attachment then choose file, that's it, post your pic that way.
Oh that's providing your using a phone, think on computer it's easier
I'm sure you'll find your way round here within days, even though your a southern softie with a Scottish name
There's plenty of guys around willing to help and you'll be more than welcome to join in.
Have a look at anutz posts, think he's done most of the things your looking to do, he'd not even lifted a spanner till he joined, now he's a fully qualified bike mechanic