mobile version is default for any forum that uses the same forum software. use the full version by scrolling down to the bottom and hitting the button for it.
you can post images with [ img]url[ /img]
youtube videos can be posted with [ media]url[ /media]
codes such as [ b] and [ i] bold and italicize, respectively. underline eludes me, i believed it to be [ u] but it didn't work last i tried it
codes like [ left], [ center], and [ right] affect text alignment in the ways you expect
search function seems to disappear on full version for phones, (mine at least.) if you need to use it, you can switch back to mobile temporarily.