@scouts2222 We can't provide links to mod pages here but if you do a search for Sims 4 MCCC you should be able to find the website easily enough. There is a download section with instructions on how to install the mod in your game. Just be warned though that changing the game speed with MC Command has been known to permanently corrupt game saves by making the game clock get out of sync with the in-game calendar. I love MCCC for many things in my game but I would not recommend using it to change your game speed. If the game seems to be going too fast it's like what @BlackjackWidow already mentioned, the Pause button is your best friend :D Proper mod maintenance is also a must if you choose to use MCCC. This mod needs to be updated after almost every game patch. Using outdated mods can cause many problems in your game and even ruin a save.
I'm just a regular Sims player, I don't work for EA.