Password rejected by by Application Express

I am a newbie in programming. I downloaded the oracle application express 11g release. I did install it and used it to practice until I logged out. When I came back, I couldn't login using my known credentials. After much battling, I reinstalled it, this time creating a new workspace and new credentials but still to no avail, it still rejected my password. Below is the message it gave.
Enter Application Express workspace and credentials
"Invalid Login Credentials"
Pls what could be wrong?
Zion

Huh, here's how I see it.
You downloaded and installed Oracle 11g XE database and used to use it by navigating to http://127.0.0.1:8080
Then you downloaded and installed (actually, upgraded) Application Express. As far as I can tell, once you did that, a fancy and good looking Oracle 11 XE homepage is no longer available. That's too bad, but - that's the way it is.
Now you can practice your Apex skills (as most of us do; you asked "why an I mentioning Apex"? Well, this IS an Apex forum, after all). You can practice your (PL/)SQL skills as well, but not as you used to. I'd suggest you to use SQL*Plus (it is a command line tool). If you don't like typing and prefer GUI, download and install (free) SQL Developer (from the OTN site), or any other GUI tool (most of which are not free). You might even use Application Express' SQL Workshop, if you wish.
Now, if I got it wrong, I'm afraid I can't do much about it ... hopefully, someone else will know better.

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