Grammar books give complicated rules, but there's a simple technique. If you know how to conjugate a verb in the Present tense, then you can conjugate it in the Subjunctive too.
Don't miss this other video on the Subjunctive, which explains what it's for and when to use it:    • À quoi sert LE SUBJONCTIF et quand l'...  

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0:00 Intro
0:48 Grammar books
1:08 Present Radical
1:48 Semiirregular verbs
4:08 Irregular verbs (Imperative)