Trouble uploading images for making it March comp

Can someone help please, i have dragged images across into the box but they only come up as image.jpg ( no image showing )! I contacted support and they said i need to use the hashtag . Apologies but i have no idea what this means, what do i write, where do i put it? I apologise for my ignorance but have no idea what to do. I was going to try on facebook but see the terms state only one entry. I don’t want to get disqualified before i even started… Thanks so much for your help and i do wish everyone that they keep safe during these turbulent times. Rgds Phil

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