The phrase "signed me up" is correct and usable in written English. You can use it when someone has taken an action in order to add you to a list, register, or organization. For example: "He signed me up for the marathon at the last minute."
They signed me up for some magazines.
They signed me up for an Indian matrimonial site.
It was my niece who signed me up for Silverline.
They signed me up until I was 19 but I walked away when I was 17.
Mr. O'Reilly said in the statement: "I had no idea my agent signed me up for this.
My mother just signed me up for classes when I was seven.
The first rejected it, but the second signed me up straight away.
It wasn't long before my parents signed me up to a local elementary school.
"My mom signed me up for this," Ms. Albarazi said after her dash around the track.
My parents signed me up for chess classes when I was 6 and it immediately became an obsession.
"My mom signed me up," said a beaming Makram.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia