Adding New Users
New users can be added to a Wrike account by admins and owners. Regular users can also add new users to the account, however this right can be removed from them in Enterprise accounts.
Admins on Professional and higher accounts can restrict invitations to users with a certain domain. Learn more on the page Restrict User Invites by Domain.
Adding a new user will give that person the potential to access your Wrike account. You can still choose which user license type to give them, which will restrict their rights in the account, and which things to share with them.
There are several ways to invite a new user to your Wrike account.
With the Add users or Invite button, which can be found in 3 places:

Open your Wrike workspace.
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Click:
Add Users (located in the right of the page footer) 1
Invite in the menu which appears when you click the + button next to your profile picture 2
Click the hamburger icon and select Invite in the left-hand navigation menu 3
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In the dialogue box that appears, enter:
The email address of the person or people you want to invite 4.
The type of license they should have 5.
(Optional) Click Add to group to select a user group the new users should be added to 6.
Click Invite users 7.
Via Sharing:

Open a task, click the Shared with icon 1 or right-click a folder or project from the workspace's left-hand navigation panel, and click Share.
Enter the full email address of the person or people you want to invite to Wrike 2.
Click Invite to Wrike 3.
In the dialogue box that appears, select if you'd like them to be a regular user, external user, or collaborator.
Click Invite User.
The task, folder, or project is automatically shared with the invitee when they accept the invite.
From the User Management page (possible for admins only):

Click your profile image in the workspace's upper right-hand corner.
Click Settings.
Under Account Management select Users 1 in the left-hand menu.
Click Add new users 2.
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In the dialogue box that appears, enter:
The email address of the person or people you want to invite 3.
The type of license they should have 4.
(Optional) Click Add to a group to select a user group the new users should be added to 5.
Customize the invitation email (for paid accounts only) : click Include personal message, edit the text, and click Done.
Click Invite users 6.