I want to link 2 routers wirelessly?

It sounds more like you need to build a WAN than to link two routers wirelessly.

You need to access the setup of each router (Normally the url for a single router is 168.192.1.1, then you will need a username and password, generally admin and password unless you have changed it) then you need to see how you set up a WAN with your router’s particular firmware.

Correction: the default IP for most routers is 192.168.1.1 or 192.168.0.1

Some routers allow you to setup a “repeater mode,” where it catches the signal of a main router and sends it again to extend coverage. It would be really helpful if you found a manual for your specific router models.

Look in the manuals or setup screens for these terms:
Bridge
Repeater
Wireless Distribution System
WDS

You may not find it. Not all routers can connect this way.