This is an accepted solution.
I'd love to help you out! I would just some more information:
Where are you trying to upload the image? The homepage or certain product pages?
In the homepage, in the customization of the theme you have options to add things such as "image with text", "slide show" etc in which upon adding you can upload your own images to.
For products, once you have named your product and added a description, right below there is an option to upload your product images as well.
If you're looking for more help, I'd be happy to help you solve this further.
If you'd like, during Covid we are offering new merchants free creation of Shopify stores as Shopify Partners.
No catch, we would just need your product and store details and we can set you up with one!