[HELP] Customizing SMF

[JaymzAO]

My forum's poster (idk what's it called) looks like this,

and it doesn't look good, I wanted to change its replacements to something like this,

How and where do I do that? Thanks

[Kindred]

those are two different themes.

If you want to use the second one, then why not just use that theme?

[Biology Forums]

What's your website URL and the URL of the website with this desired look?

This is completely doable, just requires changes to the stylesheet.