Then you can purchase the image for 1 USD (one time use) but before you do that read the Learn more about our licensing options to better understand how you can use that image (shortly: you have 24h to make changes to your design and download it again, after that it will be watermarked again, at least this is how I have understood it.)
My personal advice is to first download a watermarked draft and see if it goes well for your website and make changes if needed, only after that purchase the one time use license. I say this because I did first choose 150px * 150px design and did purchase the image and didn't know how to change it afterwards to 200px * 200px so I needed to purchase it again.
That's it!
I hope this was useful to you!
Best wishes Maria
If you would like to see what I have done with canva for only 2 USD take a look my header image... eliminateyourbackpain.com/what-causes-back-pain/
Thanks...Charles