Planable offers the option to tag both company and personal profiles. Please see below for instructions on finding the exact handle:

In your composer, add "@" followed by the name of the company page you're trying to add. If you're having trouble finding the right account, we recommend going to the LinkedIn company page, and copying the page handle as it appears in the URL:

Then, back in Planable, paste the page handle after "@":

The same process applies to personal profiles. Please note that you can only tag personal profiles that follow the company profile you're trying to tag them on.