Upon installation Plauti Deduplicate was installed for the Lead, Contact and Account Object by default. Perhaps you added additional Objects during install as well. 

After installation, you can manually add and configure more Objects to Plauti Deduplicate via PD Setup, but you can also choose to add Objects via Plauti Cloud:

1. Log into Plauti Cloud
2. At left, go to Installer > Install Applications  
3. At Select a Connection, select the Org where Plauti Deduplicate is installed
4. At the Plauti Deduplicate line, click Configure
5. At Search and Select More Objects, add the Objects you want to add to Plauti Deduplicate
6. Click Next
7. Review the configuration summary and click Start. 
   The selected objects will now be added to Plauti Deduplicate. 
8. Keep track of the configuration progress via Install Applications > Show Progress, and once configuration is finished, you can check the result via Install History.
9. Once installed, go to the Plauti Deduplicate app > tab Deduplicate Setup. Select the newly added object at left and configure it further.