Icon issue in the "THE CAPPA" WP theme - help needed!

On the front page on the “The CAPPA” theme there is a reservation phone number and an Icon of a phone, it looks like it uses flaticon-call in the header Sidebar Settings, but if i like to use another icon, where do i set this up? can someone point me in the right direction? Do i need to have a payed subscription at flaticon to use my own icons? Thanks for you help.

link to the theme: Dark Sidebar Home 7 – TheCappa

@shtheme

Same problem here