Magento – system.xml admin menu – disable autocomplete in username password

As mentioned in comments to OP question, this is a duplicate of Possible to hide admin menu if custom module is disabled?

but placed as answer to respond to OP's comments.

You will place the <depends> in the menu item configuration, as such:

(code example taken from ecomdev's post mentioned in the noted duplicate answer)

     <menu>
        <mycustom_menu translate="title" module="[module_name]">
            <!-- this depends will hide the entire menu option -->
            <depends>
              <config>payment/checkmo/active</config>
            </depends>
            <title>My Custom Menu Item</title>
            <sort_order>300</sort_order>
            <children>
                <!-- child items go here -->
                <subitem translate="title" module="[module_name]">
                    <!-- this depends will hide the sub menu option -->
                    <depends>
                       <module>payment/checkmo/active</module>
                    </depends>
                    <title>Subitem</title>
                    <sort_order>10</sort_order>
                    <action>adminhtml/mycustom_controller/</action>
                </subitem>
            </children>
        </mycustom_menu>
    </menu>

The default username and password should be that which you added in installation process.

For change username and password, You need to change from database.

The default login is : admin The default password is : 123123

Just run at your sql database:

SELECT *FROM admin_user;

Then, find the username you want to modify in the listing provided - ‘admin’ in this example. Then, to update the password, type:

UPDATE admin_user SET password=CONCAT(MD5('qXpassword'), ':qX') WHERE username='admin';

‘qX’ would be changed to whatever you want it to be and same goes for ‘password’