There are a few ways to sign in to Web:
•Sign in with Enterprise Portal
To sign in to a web app with ArcGIS Online:
1.In a web browser, launch your web app.
2.If you are prompted to sign in, click OK. If you are not prompted, click Sign In.
3.If necessary, click ArcGIS login to expand that section.
4.Type your ArcGIS Username and Password.
If you want to remain logged in, select Keep me signed in.
5.Click Sign In.
You are now signed in.
To sign in with Enterprise Portal:
1.In a web browser, launch your web app.
2.If you are prompted to sign in, click OK. If you are not prompted, click Sign In.
3.Click Enterprise login to expand that section.
4.In the box, type the first part of your organization's ArcGIS subdomain.
If you want the computer to remember your login details, select Remember this URL.
5.Click Continue.
6.Click your organization's name.
7.If necessary, type your user credentials and click Next.
You are now signed in.