Click on the Settings button at the top right of your screen.
Select IP Addresses at the left of your screen.
Click Select File to choose a file with multiple IP addresses in .csv format.
Click Send to upload the file.
You can add each IP address manually. To do so, enter an IP in a proper field depending on the type of IP address. Then, click Add to confirm.
To add IP v4 Range, enter your IP v4 range in CIDR format in the proper field. Fill the CIDR box and press Add to confirm.
Press SAVE to keep changes.