help please!

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hi  , im trying to get my store up and running but having a hard time doing everything i need to, im not very tech savy .


im currently in putting my products and am adding pictures to the rich text box ( if thats the right analogy ) , so they can display on the page of thst partivular product, however i am only able to have them stack below one another, i want to use more of the blank space on the page ideally but at the least i want to have 2 or 3 images horizontally alined rather then vertical. but as you can see there is plenty of Black space on the page i seem to only be able to use the right side 

password is cvc2021

using the debut theme

thanks to any one that can help