You can try using the browser actions to set field to whatever your username and password is. How ever not all websites are built in such away that this will work. You other option is using found images to input the info but this may not be 100% reliable. Either of these methods however would require you to have a copy of your password in km which some people recommend against. I have a few macros that do this for me though and after enough tweaking they work 99% of the time. I’ll try and post some more info on how I did it tomorrow when I’m back at my computer.
It goes without saying that placing your password in a macro is a bad idea, from a security perspective.
Also, some websites go out of their way to make automated logins difficult (eg, captchas). Different approaches may be better for different websites. Since you haven't said which website you are accessing, it's hard to give you the best advice. I'm not sure if the senior members will give much advice on this subject since it's a security pitfall. You don't own a password management utility? (I don't use them, but they might be more secure than a home baked solution.)
By using the "Set browser field to text"...you can do this with Safari, Chrome or "front browser" which has limited support for other browsers.
Insert the action, then click the corresponding browser name (on the right of the action) which will display a dropdown menu that has all the fields that can be set using KM. Usually they will say something to the effect of email or password. In the second space of the action you would then put the corresponding info, email or password.
If the field isn't there, it can't be populated this way.
Again, this isn't a very secure way of doing this, so use it at your own risk. I only use it on one website.
The smart, reliable, and more secure ways to solve this are by following the advice that others are giving you here. But there are other solutions. Firstly, I noticed that the link you gave me isn't actually the login page. There is at least one other link to an actual login page, which is:
But if you are a paid user of their service, then you shouldn't be using that page at all, because there is a different page for you to avoid all the ads, popups and latency.