Step 1:  Click the Paraphrase Logo in the upper left hand corner of the Paraphrase window and select Change Active Database...

Step 2: Browse to the desired paraphrase database. This may be on your computer or on a computer on your network. If you wish to use a shared paraphrase database located one one machine, all other machines must have the database path set to the location where the paraphrase database is stored on that machine.

The factory default database name and location is:
C:\Program Files\Chirosoft\Paraphrase\paraphrase.mdb.