How can i open a link directly from an Action.

I do not know of a way to have an Action link directly to an external site, but you can have the action open to a form and then use a!safelink to link to the external site: forum.appian.com/.../SAIL_Components.html
If you configure the form as a quick task with a timeout then it will not show up in the tasks tab and you will not need to include a button on the form, this way it looks more like a link rather than looking like a form.

I do not know of a way to have an Action link directly to an external site, but you can have the action open to a form and then use a!safelink to link to the external site: forum.appian.com/.../SAIL_Components.html
If you configure the form as a quick task with a timeout then it will not show up in the tasks tab and you will not need to include a button on the form, this way it looks more like a link rather than looking like a form.