i'm a bit stuck on something, but any assistance appreciated

 This is a bit techie... for one of these ..

I have revived an old laptop that is now a useful thing when I dont want to use main lappy, which is ace.

I have put Linux Debian on it (the old one).

There used to be a thing called compcache , and in later distributions of linux thats called zram now.
the zram is already used on the other laptop which is on ubuntu.

If theres a techie that can send me what i need to do in root terminal with exact instructions, i'd like to try and increase ram virtually on the old machine with debian on it.

Anyone help me on that? cos thats the bit i'm quite stuck with.

Anyone?
Cheers
Jules.