You can find the See app in the Slack directory or by tapping this link:

After tapping the Add to Slack button you will be prompted to allow permissions to your Slack workspace. 

When you accept you will be displayed a confirmation page.

To use See inside Slack you just type the /see command and you will get a button with a link to your See screen share and video conference.

To invite specific people to a See session you first just create a group with them in and then type the /see command

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