How do I complete a Port in request?

Does anyone know how I complete a port in request ?

Step 1: Get your PAC Code
From your current (old) network's SIM card, text the word PAC to 65075.
You will receive a text message within a minute containing your 9-digit PAC code.
This code is valid for 30 days.
Step 2: Activate your Lebara SIM
You cannot port your number until you have a working Lebara SIM.
Insert your new Lebara SIM into your phone.
Make a quick call or send a text to ensure it is active.
Note: You will have a temporary Lebara number assigned to this SIM. Keep this number handy, as you will need it for the next step.

Step 3: Fill out the Port-In Form

https://www.lebara.co.uk/en/portin.html

and enter the following details:
Temporary Lebara Number: The one that came with your new SIM.
Existing Number: The one you want to keep.
PAC Code: The code you got from your old network.
Date: You can choose the day you want the transfer to happen.
Key Information for Porting
Timeframe: If you submit the form before 5:00 PM on a working day, the transfer usually happens the next working day. Transfers do not typically process on weekends or Bank Holidays.
Downtime: On the day of the port, your old SIM will lose service first. A few hours later, your Lebara SIM will pick up the signal for your original number.
Troubleshooting: If the signal doesn't appear by the evening of your port date, restart your phone. This usually "kicks" the network into recognizing the new number.