The most likely answer is that you are not logged in.
To check if you are logged in, on desktop, look at the top right of screen, if you see your name & username then you are logged in.
To check if you are logged in, on mobile, look at the top right of screen, if you click the menu button (three white stripes) and see your name, username and options such as 'Search Jobs' and 'Account Settings' then you are logged in.
If you only see Login/Join then you need to click login and enter your credentials in order to start quoting.
If you still have issues after this then please contact support@truckit.net.