I will record in detail the progress I have made so far (for other laymen who wish to install WireGuard), but it is far from over!
Well, as I asked before, there is no detailed tutorial, just abstract guidelines, but that lay people cannot follow.
What I've achieved so far:
(1) I got a pendrive and with the software 'Minitool partition Wizard' (which can be downloaded here '
https://www.partitionwizard.com/free-partition-manager.html') I formatted it for Ext4;
(2) After formatting, I put the USB stick on the router;
(3) enable SSH on the router using the following menu:
Administration> System> Service;
(4) I downloaded the 'PuTTy' software and inserted the router's IP and then 'open', as shown in the following image:
(5) After entering the router, through PuTTy, the first command to be entered is the name of the router's administrator and password, as follows:
(6) After that, I typed the command 'amtm' and hit enter, it looks like this:
(7) Then, I typed the letter 'i' and hit enter. Next, I typed the letters 'ep' and hit enter. Then just go entering the numbers that were requested and that's it, 'Entware' installed.
(8) I don't know what else to do from here ???