We highly recommend you set up authenticator app two-factor authentication on your Slash account.
Steps to configure:
Click the hamburger menu at the bottom left of the dashboard
Click on "Personal settings"
Click on "Account & Security"
Click on the "Two-Factor Authentication" toggle
Download an authenticator app from the app store like Authy, Duo Mobile, or Google Authenticator
Scan the QR code that comes up with one of those apps
Input the code generated for your Slash account from one of those apps
Now when you log in, you will be prompted for a code from the app you used to configure two-factor authentication.