When you create your YouTube channel, the custom thumbnail option will not be activated by default so you have to enable it through YouTube settings. To enable the option you have to go through the YouTube verification process.u003cbr/u003eu003cbr/u003eu003cstrongu003eYou can enable custom thumbnails by entering your channel on YouTube and clicking on the customize channel button on the top right side of the screen. u003c/strongu003eu003cbr/u003eu003cbr/u003eNext, you will click on the button on the bottom left column. There you will find out your account has not yet been verified. u003cstrongu003eRequest for a verification code and enter your phone number. u003c/strongu003eYou will receive your code within a minute and enter it. Verification is complete after clicking the submit button.u003cbr/u003eu003cbr/u003eOnce your account is verified, you can go to your channel videos and select any video to add the custom thumbnail to select the thumbnail you want for the video and save!