The blue tick on Twitter indicates that a user has been verified by Twitter as an authentic account for a public figure, celebrity, or brand. To request verification, you can follow these steps:

1. Ensure that your account meets the eligibility criteria: Twitter requires that your account is active and complete, has a profile picture, a cover photo, and a confirmed email address and phone number. Additionally, you must have been active on Twitter for the past six months, and your account must be in good standing without any violations of Twitter’s rules.
2. Fill out the verification request form: Twitter has a verification request form that you can fill out to request verification. You will need to provide some information about yourself or your brand, including links to your official website, news articles, and other supporting materials.
3. Wait for Twitter to review your request: Twitter will review your request and notify you whether your account has been verified or not. The verification process can take several weeks or even months, so be patient and keep checking your email for updates.

Note that the verification process is not guaranteed, and Twitter may deny your request even if you meet all the eligibility criteria. Twitter may also revoke verification if your account no longer meets the eligibility criteria or if you violate Twitter’s rules.