How to link my own domain name for the website on the Web1.0 Hosting?

You can link any your domian name to the website hosted on the Web1.0 Hosting. The only one requirement here: the left part before a point of your domain has to be the same, as your website login. for example:

You have a site called mysupermegawebsite.w10.site, then you can link the following domain names: mysupermegawebsite.com same as mysupermegawebsite.mydomain.com

It can be A record pointed to the IPv4 address 135.181.118.12 or AAAA record pointed to the IPv6 address 2a01:4f9:4b:1e30::3

Also you can use CNAME record and point it to your website address, same as w10.host, it also will be working.