Next, you’ll be prompted to add a description of yourself and an pic.
Most brands tend to use their company logo as their profile picture. If you don’t use your logo, make sure you use something that people will associate with your business. The best size for profile photos is 400x400 pixels.
You can also choose an image for the header area of your profile. The header will show whenever anybody views your profile, whether via desktop, mobile or tablet. The header is a lot larger than your profile photo, so it’s a good opportunity illustrate what products or services you or your business provides. The recommended size for header photos is 1500x500 pixels.
You can use up to 160 characters to create your bio. Include a link to your website, and give a brief, positive explanation of your organisation and the products or services you sell. The best bios are short and sweet, and allow the reader to come away with a clear idea of what your business is all about.
Just click "Save changes", and you have completed registering your basic Twitter profile.