How can I insert more notes at the beginning or in the middle of a complete music sheet?

Hi everyone,

I finish a small piece of music. After that I have an idea to put an intro at the beginning. But I don’t know how.
I want to INSERT the intro and SHIFT EVERYTHING without overwriting or deleting any notes.
Please help!
Thank you very much!

For Hookpad 1 / TheoryTab, what you can do is make a new line (the plus (+) icon at the end of a line) right after the first line, cut and paste your melody and chords into the new blank line, and add in your intro.

For Hoopad 2, you can do the exact same method.