Cannot open email, others

Please help! I installed Traveler today onto my Nexus 7 tablet for the first time. WHen it opens I see the black screen with the Traveler icon saying “connected to server, device is currently up to date”. I cannot get from this screen to access email, calendar, etc. The only way I can do is if I send an email from another account to my Lotus Notes account - this causes a mail icon to appear at the top of my screen, and by clicking this the email etc folders can be accessed. Each time I power my tablet to full down and then back on I lose the access to the mail folders so I am back at the black screen mentioned above. Can anyone advise what I am doing wrong?? Thank you very much