Could you tell me the controls of this game, because I'm already lost
You use Arrows or Left Click to move your character.
Press Z or Left Click on a NPC to interact with them.
To open the menu, you can click on the Phone icon at the top right corner of your screen, you can navigate through the apps with Left Click.
(You can also press X to open the menu and navigate with the keyboard, but some features are limited for now.)
To answer your previous question, you can click on the Tasks app after opening the Phone Menu. (it won't work with the keyboard mode)