Changing carriage belt?

Unlock the printhead carriage, slide it fully to the left then slowly move it towards the right at the same time use your finger to move the belt off the plastic cog.

Don't forget to remove the plastic strip (forgotten its proper name) from the sensor at the rear of the printhead assembly if you intend to take the carriage off its tracks.

Easy and you'll get used to it.

I meant getting it off the left side plastic wheel so the belt is completely off and it can be replaced. Thanks

when you remove the left cover, on the back of the printer there is a clip (e-clip) the hold the shaft of the roller, just remove it an pull the roller assembly from the printer wall and then you can remove the roller up
hope this help

E-clip removal (and it's name) is what I needed. Never encountered one before. Thanks!