Login on a site and use a section of a site.

I am doing an app to access an webpage. I would like to know how to enter the name and the key on a textbox at appinventor and these informations be used to enter on the site. I think that if we discover how can I use just a section of the page, I can use just the box of the page that i should put the username.



Victor... Please do the tutorials... The tutorials are located here:http://appinventor.mit.edu/explore/ai2/tutorials



I've already seen this, but it didn't help me so much.



does that page use basic HTTP authentication?

if yes, see here https://puravidaapps.com/filedownload.php#restricted

I do nota know if it's http, do you know how can i ser this? Bit this mothod use only one username, this site has specific information for each user how can i do for this case? And what about show on the APP just one section of this page? Thank you so much.