Once a user has confirmed their invitation email, they can gain access three ways;
  1. Go to renxt.blackbaud.com or fenxt.blackbaud.com and enter your confirmed credentials
  2. Go to blackbaud.com  click sign in from the top right. 
  3. Highlight "product logins" from Blackbaud.com and select either Raiser's Edge NXT or Financial Edge NXT to sign in.
To learn more, check out Getting Started with Raiser's Edge NXT Web View or Getting Started with Financial Edge NXT Web View.