I've reached to the 1st diary and it's about a bicycle or sum. I tapped scooter and it doesn't work..

We already have an answer for a similar question which you can see here:
How do I unlock Zoey's diary - page 1?

If you have more answers to add you can do that below.

Go on gallery and you will see a picture of a pink bike and on top it will say, “From mom” now go back to the diary and add from mom and its the code to unlock the first page

Bicycle