It means "want."

"たがる" with a conjugated verb means that someone else wants to do something as in "彼はテレビを見たがる". You can't use this expression for yourself. "私はテレビを見たがる" sounds weird. 

The verb ending -たがる means that someone else wants something.

話したがる (s)he wants to talk

話したがっている (s)he is wanting to talk

See the explanation here: https://jlptsensei.com/learn-japanese-grammar/たがる-tagaru/.