1. Open Roboform Settings
You can do this from the extension by selecting the Options (three vertical dots) in the Roboform browser extension and then Settings
OR 
If in Start Page, selecting your profile in the top right corner and then Settings
2. Export the existing passwords
In Settings, go to Account & Data and select Export.
Enter in your master password and then select Export again.
3. Import into Keeper
Log into Keeper, and then select your profile in the top right corner and then Settings
Select Import and then Roboform
Drag and drop the CSV from step 2, or browser to where it is saved.