Image Alignment

[srinik]

Hi!

Is there any documentation for using nodebb?
As a first time user, I'm facing many problems in customizing it.
In my previous post, I enquired about creating tables.
Now, I would like to align the image to the center.
When I try to upload an image, it gets aligned to the left (by default).
So, would like to fix it.
There are many such queries so would any one recommend some documentation.

Thanks in advance.

Srinik.