You will need to press CTRL, SHIFT & Delete (screenshot below for keys to press)
Once these have been pressed you will be presented with a pop up window. Below are screenshots from different browsers.
Please ensure you only have 'Cookies and other data' ticked all other options need to be blank. You will then need to press 'Clear Data'
This will run and the above pop up window will disappear. You cookies and cache will have now been cleared.
You will find when you go to a tab within your internet browser, you will need to log back into all of the applications you have open.