Send hyperlink of workbook to selected Outlook User Groups - UserForm?

Hi,

I have created VBA to email a hyperlink to my spreadsheet. What I am looking to do now is be able to pick certain Outlook Distribution Groups to e-mail to? I have created a UserForm and the VBA but I am not sure how to put them together?

The code is as follows:

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I have attached the spreadsheet that has the UserForm started.

Any help would be greatly appreciated!

Thank you,
Sandi