Andrea, PLEASE do not give up! What you learn can be used to improve the manual procedures.
Instead of using the "seq" line from the manual (which may be bash/desktop based) like Ed said just run the single line.
1) For example keyin: cin -d 10445 (or use the full Cinelerra path if "cin" is not defined)
2) You should see something like the following on the terminal window:
Cinelerra Infinity - built: Mar 9 2021 17:02:31
git://git.cinelerra-gg.org/goodguy/cinelerra.git
(c) 2006-2019 Heroine Virtual Ltd. by Adam Williams
2007-2020 mods for Cinelerra-GG by W.P.Morrow aka goodguy
Cinelerra is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. There is absolutely no warranty for Cinelerra.
[root@keystone ~]# init plugin index: /mnt0/build5/cinelerra-5.1/bin/plugins
init lv2 index:
RenderFarmClient::main_loop: client started
3) Next check just to see if that worked. Keyin: ps -ef | grep cin
4) You should see something like the following:
root 161032 161015 0 14:46 pts/2 00:00:14 /tmp/cin5/cinelerra5/cinelerra-5.1/cinelerra/ci
root 161415 161398 0 14:48 pts/3 00:00:11 /mnt0/build5/cinelerra-5.1/cinelerra/ci
root 162255 1 0 15:48 pts/4 00:00:00 cin -d 10445
root 162287 1 9 15:49 pts/4 00:00:00 /mnt0/build5/cinelerra-5.1/bin/cin -d 10446
root 162291 161717 0 15:49 pts/4 00:00:00 grep --color=auto cin
5) The ones marked in bold above are the render farm ports. (Yeah, yeah, I know I should not use root but have for years).