How to make posts wider in wordpress

I am sorry but your link is not working, can’t help you without it.

It should be working ?? https://moni2168.keaweb.dk/wordpress/

Not working. Giving me following error.
“Uh-oh, something went wrong! Error Code: 403”

Can you help me without the link? i really need help!

I am sorry but it is not possible for me.

I have the same inquiry, please advise with my site