Please help me; I do I ignore sudo password while I want to execute a command?

do you have rootsh installed? if not, you need it.

No, how do I get to install rootsh?

Open Application Manager, enable the extras repository, wait until the package list cache is updated, or if the repo is enabled, just update the list. Then install rootsh package.

Or grab it from the repo server directly with the browser at http://repository.maemo.org/extras/p...sh_1.8_all.deb , save the file and tap it in the File Manager.
ApplicationManager will take over and installs the package.

rootsh is installable through Hildon Application Manager. You will need it in any circumstance where you need root access to your device.

rootsh will ask for a sudo password, though, so on top of rootsh you can either install sudser, to be found here
http://maemo.org/packages/view/sudser/

Or you can manually edit the sudo requirements in
/etc/sudoers.d/01sudo and add sudo as a passwordless command.

You can also ssh root@localhost, if you have an ssh server installed