I am sorry, I mentioned a second page in the G-325A ,mistakenly. I became confused with the I-130 itself which has two pages.
You are right, the G-325A is one page.
But at the bottom of the G-325A there is a big rectangular box in heavy border and on top says:
Applicant: Print your name and Alien Registration Number in the box outlined by heavy border below.
Inside the box says:
Complete this box:( Family Name) (Given Name) (Middle name) Alien Registration Number
In that box is where you hand write your name in block letters.
Note: It is recommended that the petitioner always uses his/hers Alien number where it is asked. It helps USCIS to verify who you are.
If you do not know what is your Alien Number, it is the number of your old green card, that number is also in the US Citizenship certificate and always starts with the letter A. For the beneficiary type NONE when it refers to an Alien Number.