Where can I find a user-guide for the awfull Text-Editor used to enter/edit these forums entries?

Question

I am desesperate to understand how quite basic functions (just as one of many examples: how can I paste text, that I have formatted in MS Word and want to paste into a Forum Post-Entry?) can be done with the primitive and awful Text Editor used to enter/edit Forum Entries. Notice, that like many other Adobe users, I am not familiar at all with HTML and it is therefore a description of the badly named "Full Editor" that I am looking for.
Where can I find a User-Guide for this Text Editor?
My recommendation to Adobe: exercise enough  brute pressure on the developers of this primitive Text Editor to force them to provide something more reasonable, more powerful and more intuitive.

Answer 1

Thank You Jochem
I was trying to understand how I could do things as simple as inserting text that I had previously copied. Since there are neither command menüs nor buttons for the Insert of previously copied text, I was trying a mouse right click.....and was being offered in the context menu the choice between "Insert Link", "Insert Image", "Alignement", and "Insert Table"....... but no possibility of a plain insert of previously copied text.
Now, I realize, that Clearstream supports at least the keyword shortcut of "Ctrl V" ........that I am not using in any other software (I never use any keyboard shortcuts).
Since Clearstream does not support reasonable choices in the contextual menus, I will need to memorize the most important keyword shortcuts.
By the way: I detected now, that the "Ctrl V" keyboard shortcut allows me to insert formatted text.
Even, if I will now begin to be able to use reasonably Clearstream, I am quite surprised to see that such a software provides neither reasonable Contextual Menus, nor a User Guide, nor........
Thank you again Jochem for your patience with me.