quick criticism, in the above post there's nothing to differentiate the post content and the signature. they're both just bubbles of text, so you can only infer what's what.
you might want to do something to make your signature look like an element that's optional to read, rather than any important part of your post.

there are a few common ways to achieve that:
- you can add a unique, clear separator between the post and signature that occurs only once per post
- you can wrap the signature text with an effect overall unique to itself (such as italics covering it all, half opacity, smaller size, or a combo of any of these)


btw in order to do any of the things you listed above, you'll have to learn to use internal styles rather than inline styles.
internal styles use <style> tags, whereas inline styles go <div style="color:blue;">this text would be blue</div> which's what you've been using til now.

Styles like the ones I used right above go like this:

Which then gets applied to the element specified, which in this case is the class "some_name". This will affect ALL elements with this class, which means you don't have to rewrite it for every single element. You can target any element using this (and thusly need to do so in moderation) meaning you can style hotlink tags within your posts, like so:



Here the a tag is hotlink, which is contained within the element of the class some_other_name.

I recommend you go and learn more about CSS and then experiment with this kind of stuff on your own. This is a whole can of worms so what I've written here isn't really sufficient to do all that much. notably, hotlinks have several different states (regular, hovered, currently being clicked, previously visited, etc) which all can and should be customized accordingly. google is your friend.