EF 75-300mm How to Focus at 300mm

[Styner]

Hi I have A canon rebel T3 with 75 to 300mm f/4 5.6 lens. I currently have it to 300mm . How do I get it to Focus? Because when I look in the eye piece it’s blurry 

[Styner]

 so something like this 

[deebatman316]

Note the original 70-300mm lens DOES NOT support Full Time Manual Focus. Despite the lens saying "USM" this lens uses "Micro Motor USM". So DO NOT under any circumstances turn the focus ring while the lens is set to AF.