As one of your first steps when starting your journey with Transposit, set up Slack, as described below, then add a custom Slack field in a template.
You will then have enabled your team to set up Slack in their activities and use Transposit from Slack.
In the Team settings, you connect and read a user directory from Slack and add a Transposit bot to it.
In the Account settings, you link a Transposit user with a Slack user. This enables Slack content to be brought into Transposit and to associate it with the correct users.