how can i open in my page instead of myprofile

Hi Maria, are you using a desktop shortcut or taskbar button to start Firefox? It's possible that there is a -P in the shortcut "target" line to call up the profile chooser. To check and edit:

• right-click > Properties (on the Taskbar, you might need to right-click the pinned shortcut, then right-click Firefox and then right-click Properties)
• Windows should select the Shortcut tab but, if it doesn't switch to the Shortcut tab
• Check the Target line to see whether it has any parameters after the standard command
  "C:\Program Files\Mozilla Firefox\firefox.exe"

If there is anything extra, you can delete it.

Was the problem there?

Actually, here's something to check first.

In Firefox, click the main menu button (the one with a stack of 3 lines), then click the profile name and click Manage Profiles.

On the panel that pops up, check at the bottom for a checkbox labeled "Choose a profile when Firefox opens". If that has a check, remove it.

Mentioned under "Choose a profile at Firefox startup" in this article: Manage Firefox profiles.