How to get to termninal to sudo etc.



I hate to ask since it seems like I let everyone do all the work/learning for me….but….
How do I put pulse audio equalizer on my system…start to fiinish step by step?
My only  excuse is that I am 73 and barely manage stairs let alone remember how to connect and do all that sudo bit.  I completely forget how to go in with terminal.

Anyway if someone would be kind enough to show me the steps to add the pulse audio equalizer and then the front end addon to my particular system  I would be very grateful.
I use it only for listening to music and would love to take advantage of an equalizer.
Thanks to anyone who takes the time.
I use Confluence skin
Libreelec 10.0.4
Kodi build 19.5-6 Matrix