Pressable has an accessible login link right in their website navigation. Here is the official Pressable login URL:
Pressable Sign In
If you prefer, you can also login with an account from GitHub, Google or WordPress.com.
Note: I always caution against using third-party authentication for important accounts as you don’t want to tie together accounts from different vendors with one password or set of credentials. For example, if you lose access to your Google account, you could also lose access to every service that uses Google authentication! I reserve “Login with <fill in the blank>” for unimportant or temporary accounts, not something as important as web hosting.