SQL map help please

[Monster10]

Hi
Im somewhat new to pentesting and, after watching this video https://www.youtube.com/watch?v=2YD4vygeghM
I decided to try out SQLMap. I set up the Metasploitable 2 VM, captured the request with burp, and saved it as request.txt.
I then ran the following command

sqlmap -r /root/Desktop/request.txt --dbs

In the video, the output is almost instantly displayed. When I tried it, it took forever and never finished.
I also tried the other following commands on the OWASPBWA VM with no success

sqlmap -u "http://192.168.184.129/mutillidae/index.php?page=login.php" --data="username=asdfg&password=asdf&login-php-submit-button=Login" -b

and

sqlmap -u "http://192.168.184.129/mutillidae/index.php?page=user-info.php&username=asdfg&password=asd&user-info-php-submit-button=View+Account+Details" -b

Neither worked.

Any help would be greatly appreciated.