If you mean the master password to F-Secure Key, follow these instructions:
Note that if you forget the master password all data is lost
For Mobile Security I guess this time
You have to open a support ticket to get help with that: http://www.f-secure.com/en/web/home_global/support/contact/request
Or try resetting it from the "trusted number":
I moved your post to the more relevant board for Mobile security.
Please follow @NikK instructions above, so that we can help you with your problem.
Edit: Activated @mention notifications
This topic has been closed due to inactivity. If you would like to discuss this topic further, please start a new post.
You can reference this topic in your post by adding this link:
Visit the Community
Check our Forums or How-to & FAQs for advice or answers
View User Guides
Refer to our getting started guides and product manuals
Talk to our Support agents and get answers to your questions