Subject: YAY! You’re part of the family < User name >!
Hey < User name >,

thanks for signing up with < Your App Name >! We’re really excited to have you onboard with us. You’re just one step away from using < Your App Name >, so click here < provide link > and we’ll quickly set you up.

If you need any help, click here for our help guides or you can even have a Skype session with me, if you want to have a detailed discussion, I would love to hear from you. My ID is < Skype ID >

Thanks and see you soon!
< Your signature >