Having trouble putting the fuel tank filler hose back in/on

Hi, have a quick question. i have the truck listed above XL model. i dropped the rear tank to rebuild the fuel pump all fixed. My question is, I'm having a lot of trouble trying to put the fuel filler hose back in/on, i have no idea. i tried for hours to figure it out. I'm so unsure I'm honestly stumped thought maybe i ask here you guys are usually great with any help, advice, or tips. Thanks, take care.