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Click the dropdown next to your user-name in the top right-hand corner and select “Upload new project”. The page you are brought to should guide you enough.

You probably also want to read https://itch.io/docs/creators/quality-guidelines first, too. It applies to you especially since you have indicated that your project is for adult audiences.

Do not create duplicate topics, especially low effort ones. Before you ask someone to spend your time helping you, you should spend some time trying to understand how things work first.