If you're an admin or have been given the right permissions, you'll be able to create and edit projects. Here are a few different ways to do so.
Creating projects in Slack
When entering your work log you'll see a button to add a new project (assuming you have permissions to do so). Clicking it will open a dialog where you can name your project and enter other projects attributes.
You can also use the command
add project followed by the project name. Type multiple comma-separated names to quickly create several projects.
add project Name of the Project
add project First Project, Second Project, Third One
Creating and managing projects in your team's admin area
The best way to manage projects is to do it from the All Projects page, where you can browse a list of the projects that exist, see who created them and how many work hours they've each accumulated. Click the Add Project button to create a new project or the menu button at the right of each row to edit an existing one. This method allows you to edit the name as well as other project properties. It also allows you to perform actions such as merge, archive and delete projects.
Note: the same menu button exists in other places throughout your reports center, such as the Project Report page, which you can get to by clicking the project name anywhere.
Alternatively, if you just need to quickly create a project while you're entering your work hours, you can type a new project name in the list of projects and a button will appear allowing you to create it there and then.
Who can create and manage projects?
Admins can edit any project, anytime. If your Team Settings allow any user to manage projects, non-admin users will be able to edit the projects they've worked on and create new ones.