Change and adapt to my site images from a WP theme

I have bought a WordPress theme cryptoland 4 and will start using it for my website reitiscapital.com The old theme that you can see now online will be replaced with the new one but we need to adapt few of the theme images for us, like replacing the bitcoin with our token, etc. There is a big image at header which have to be replaced totali and 3 other small images to replace bitcoin sign with ours. The design must be high quality. Please take a look at this pdf file where I've shown what is has to be replaced and changed.