How can I add a collegue into my account?
If it is a personal account, no.
I've moved this from the Using the Community forum (which is the forum for issues using the forums) to the Account, Payment, & Plan forum.
As Peru Bob said, you can't do this with a personal account.
If you have a Teams/Enterprise account, then you can add users
and assign licenses to them
To share and collaborate on Creative Cloud, see help articles below.
I went to the link you wrote me, but the page seems to be unavailable:
Page not found. For help, visit Adobe Support.
So, what can I do? Thank you in advance for your interest,
Both links work fine for me. Try using a different device.