• Open the View menu.
• Go to Text Size.
• Choose the size that you require.
• Note: If this does not work it could be because your computer settings cannot be changed due to local IT policies - contact your local IT support for further help. 

• Open the View menu.
• Select the Text Size option.
• Increase or decrease the text size with the mouse or by using the up and down arrow keys and pressing ' Enter '.

• Click the wrench icon on the browser toolbar. Mac users: If you don't see the wrench icon, go to the menu bar at the top of your screen and click View.
• Find the "Zoom" section in the menu and choose one of the following options:
• Click + to increase the text size.
• Click - to decrease the text size.

Safari

• Go to the Edit Menu 
• Go to Preferences 
• Go to the Appearance Tab and click on Select next to 'Standard Font'. Here you can change the standard font and the text size. 
• You can also go to the Advanced tab and choose to never use a font size smaller than a particular size. 
• You may also temporarily zoom in to the page by going to the View Menu and clicking Zoom In (Ctrl++)