@Lazar-Demin I just found out that the way I am connecting the relay was soooo wrong sorry for your time. I will delete this post.

thank you @mark-doutre everything works now

I can permanently edit resolv.conf but it is cleared on the next boot

Edited the /network file and I was able to login to the network with the desired IP address. But I don't know how to setup nameservers since without them I cannot ping domain names (but I can ping the router).
Here is my setup (I tried option dns-nameservers but with out luck) :
config interface 'wwan'
option proto 'static'
option hostname 'OnionOmega'
option ipaddr '10.0.0.70'
option netmask '255.255.255.0'
option gateway '10.0.0.2'
option dns-nameservers '8.8.8.8'

You can always use Sublime Text with SFTP/FTP plugin to connect through ssh and sync files while editing them (you set it up to upload your file every time you press save)

Thanks will try both

Do you guys know how can I set a static IP address for the wifi (wlan0 - the one that connects to my router)?