To invite a guest in the Signal OnSite app, follow the steps below:

Step 1. Tap the ➕ icon at the bottom of the screen.

Step 2. Select the "Invite a Guest" option.

Step 3. Tap "Create invitation".

Step 4. Set the timeframe for the visit by selecting the arrival and end date and time.

Step 5. Choose the destination for your guest and confirm by tapping "Apply".

Step 6. Proceed to the next step by tapping "Next".

Step 7. Tap "+ Add guest".

Step 8. Fill in the guest's details:

• First name
• Last name
• Guest email

Step 9. Fill in additional details and finalize the invitation:

• Check if the guest requires assistance in case of an evacuation.
• Choose the language for the email invitation.
• Tap "Add guest".
• On the next screen, tap "Send invite".

The video provided demonstrates the entire process of inviting a guest in the Signal OnSite app.