Why rappeler and not souvenir?

Hi Gordon, 

You can use se souvenir and se rappeler for to remember something but not in the sense of reminding as in the lesson. 

The Kwiziq lesson you are looking for is -

https://progress.lawlessfrench.com/revision/grammar/expressions-for-remembering-se-souvenir-de-se-rappeler-de

Hope this helps!