When you installed XE 11g you had to specify a default password for certain database userids like SYS and SYSTEM.
Try creating a connection definition with the SYSTEM user and that default password, not your web/email userid.
For more details, see https://docs.oracle.com/cd/E17781_01/admin.112/e18585/toc.htm#XEGSG111
in the section 2 about creating a database user, and especially a bit further on past 2.5 in the tip titled
SQL Developer as an Alternative for Creating Database Users
Section 4.1 gives a SQL Developer connection definition example for user CHRIS, which assumes you (or someone) created user CHRIS from another user with sufficient privileges, like SYSTEM.
You have to use either SYS or the SCHEMA that you created in the DB. i.e USERNAME should be either SYS or SYSTEM, and the password should be the same which you gave during installation
Also check the DB Name. SID should contain the right DB Name.