Does anybody know of sites that have free voice lessons or vocal warm ups? I am trying to become a better singer, but i don't want to take actual lessons. So far i have been using http://www.voicetraining.com/online.htm and i like it but does anyone else have a different website?
Or do you have any tips for me on how to extend my range and not sing out of my throat? Thanks a lot 
http://www.vocalist.org.uk – a great site! I took lessons from there, too.
then. you can search on wikipedia some articles, like:
for voice registers: http://en.wikipedia.org/wiki/Human_voice
vocal ranges: http://en.wikipedia.org/wiki/Vocal_range
(these are the basics.)
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To extend your range: practise everyday the scales. then find out what's your range – the highest and the lower note. practise that notes and.
singing arpegio helps you extend your range: do – mi – sol – do… and back – do – sol – mi – do
Sing from your diaphragm!
How? let the air flow through your diaphragm until you feel it near your stomcah / belly. put your hand there. you should feel your stomcah filling with the air. remember: for higher notes, you need more air.
good luck!