To integrate Harvest with Freshservice,
1. Go to Admin → Apps → Get More Apps.
2. Locate the Harvest app and install it.
Type in your domain name, and the text that you want to be appended as a note. (Remember that this is optional but you could have your ticket id or subject here, for example)
You will now be prompted to key in your Harvest username and password, which will integrate your Freshservice account with Harvest.
Now you can add your time tracking entry into Harvest. Just remember that you can click on remember me, so that you do not have to type in your Harvest credentials each time.