Remove the Meta widget register on network site

Hi

When registration is enabled in my Primary Site, the network sites also show a "Register" option on the Meta widget but I only want them to show a Login option there . . . I find it confusing that the register link on a network site goes to the sign up page of the main site . . .

Also themes have a default meta widget showing all kinds of links so I would want to make sure neither that default meta widget nor a once sidebar is customized appearing meta widget shows a register link . . .

What is the best way for me to do that?

Thanks in advance for any help there . . .

Regards

Sylvia