I have lost yahoo as my home page,and cannot get to my email

There is no relation between Yahoo as home page and accessing yahoo mail.

You can always open an internet browser and type the url www.yahoo.com. On the webpage you can click on "Mail" at the top of the left column. This will take you to the Yahoo Mail site. There you can type your user name and password and login.

Anyway, if you want to set Yahoo as home page you can open your internet browser and click tool->Internet Options. This will open a dialog box. Under the "general" tab there will be a text box under "Home Page". Type www.yahoo.com in the box. Click OK.

Close the browser. When you open the browser again yahoo home page will come.