I can't seem to find the left side of the page with "The Catalogue". [opgelost]

I went to the Numisdoc to know how I can add coins to my collection. Says there is a Catalogue on the left side but I don't see it.

Welcome to the forum.
There it is, top left of this (or any) page >

How do I add, says on Numisdoc, I fail to see anything it says though...

https://en.numista.com/numisdoc/how-to-enter-your-coins-to-your-numista-collection-144.html

So for example if you have this coin >


and want to add it to your collection on here, go to 'Catalogue' then 'Country list',
and click 'Falkland Islands' then put 10 2004 beside that, and it finds >
https://en.numista.com/catalogue/pieces9467.html

then put a 1 number in whichever of the first five boxes you think the coin is graded - or
put a 1 in the 'Exchange' box if you want to swap it.
If you have more than 1 put different numbers in; and if you have other coins from the same
country just click back button and amend the search. There is also 'Fast input' pictured
on that first link - I have never used it but that may help you also.

Oh OK I get it now, thank you, that really helped.