Tutorials- Help me add effects

Before i started my A2 media coursework i had never been on a Mac computer before so i was very unskilled with the software on it, especially final cut pro. When i was editing i wanted one of my shots to be in slow motion so i googled a tutorial which would help me do it. This was the tutorial below.

I also wanted to add effects on like black and white etc. so i googled another tutorial to help me do so.