Many of the features in YouTube wont be available unless its enabled.
From there, switch JavaScript to On(Green).
These steps may also not work if the YouTube app is installed.
So you may want to uninstall it.
From there, tap Go and you will be immediately taken to the desktop version of YouTube.
The desktop version of YouTube is displayed.
There you have it!
Three ways to jump into the desktop version of YouTube from your iPhone or iPad.