Factory reset for galaxy tab

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In order to change the password you must have the old password. If you don't have the old password which I assume is the case here, you must do a factory reset, you will loose all data other than what came on the tablet out of the box new, all of it. To do a factory reset just Google the make and model number and the words "factory reset" the instructions will show.

Gobto your settings then go to general then go to backup and reset open backup and reset and there you can factorybdata reset your device.

try go to settings password reset

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You need to do hard reset:
Samsung Galaxy Tab GT P1000 hard reset
Samsung Galaxy Tab GT P1000 hard reset

1 problem is I cannot verify that you really are the owner of this tab. But you should be able to do a hard reset by a turning off the tab, holding the power, volume up and home button all at the same time until it resets.

1. With the device off, press and hold Volume Up and Power.
2. Release the Power button when you see the Samsung logo, but continue to hold Volume Up until the recovery screen appears.
3. Use the Volume buttons to navigate the menu and select wipe data / factory reset. Press Home to choose the selection.
4. Press Volume Up continue.
The Galaxy Tab should then go through the hard reset process.
If you have access to the OS, you can also perform a hard reset in Settings.
1. Open the Settings app.
2. Select Privacy.
3. Choose Factory data reset

You can remove your lock by a hard reset. This procedure will erase your personal data like accounts, other passwords and etc.
- Switch off the tablet. (To force shut down, pres and hold the Power button more time).
- Press and hold the Power and the Volume Up keys.
- When you see the Samsung logo, release only the Power key.
- Use the Volume Up/Down keys for scrolling and the Power key for OK.
wipe data/factory reset
Yes -- delete all user data
reboot system now.
This procedure is same for Galaxy Tab 2.