Google Chrome

1. Once your browser is open, press Control + Shift + Delete.
2. Ensure that delete cookies is selected.
3. Click clear browsing data.
Alternatively you can click the spanner icon in the top left, select clear browsing data and repeat steps 2 and 3.

Mac Users:

click Chrome in the top menu
Choose Clear Browsing Data
Press "Command+Shift+Delete" Then check the Delete cookies and other site data Then click Clear browsing data