New CTC Owner

[EagleSeven]

But how do I do that? Cant find any videos on youtube of anyone showing it.

??? What are you asking about ?
If the Y-stepper-motor, then it mounts to case with 4 screws, thru standoffs.
Those mounting screws adjust belt-tension and can come loose, allowing motor position to rotate.
(The short belt at Y-stepper-motor does not have a tension-spring on it)

And it did come with one tentioner on each y belt. tried to adjust and now cant get spring back on.
Any tip of putting them on without getting stabbed?

One spring on each belt should be enough.
Don't want to Over-Stretch the belts !
Yes, getting them on is Not real easy.