After you have logged into Gmail, click the button on the left that says ‘Compose’. (Image 1)
This will open a new email template for you. In the first box, enter in the email address of who you want to contact. After that, enter the subject in the ‘subject’ box, and the body of the email in the box at the bottom. Once you’re done, click ‘Send’ in the bottom left corner. (Image 2)
Image 1
Image 2
To CC or BCC in other people, in the ‘To’ box, click the ‘CC’ or ‘BCC’ button and it will add an extra line underneath the first box for you to enter in your CC’d recipients. (Image 3)
Image 3
To switch between multiple accounts, click the circle icon in the top right hand corner and select the profile you want to switch to. This will log you into that account and you will be able to access the calendars and inbox for that account