MEW links to add Network to wallet

I need to add network (custom RPC) to my MEW wallet so I can interact with a staking contract for MultiVac crypto. This can be done easily on Metamask but it seems that option is no longer available with MEW. I have found via MEW help center a link to Github for adding a network. But, link yields page reading “this is not page you are looking for” and in upper left "branch manager has been moved to main " PleASE HELP

Nothing that pops up here seems related or I am not familiar with terms. I am not experienced with Github at all.

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