C-chord: Place your ring finger on the third fret of the fifth string. Place your middle finger on the second fret of the fourth string, and your index finger on the first fret of the second string. Strum all but the sixth string. Then, go back and play each string individually, while still playing the chord. Make sure each string rings out clearly.
Play the song with the audio recording. Once you've mastered the individual portions of the song, you're ready to play the song in its entirety. Play the song and strum your guitar along with the song. Try to keep up with the tempo of the song you're covering. Follow the tabs as you play. If you mess up, follow the music on the tabs and come back into the song when you're ready. Once you've become proficient at playing the riff, continue practicing until you don't need the tabs anymore.
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The simplest answer and the one that no student that ever wants to hear is practice. Changing chords is the process where many beginners fail, and quit. But after that, the rewards will be simply impressive. There are a few tricks to get a chord transition to happen faster. Use a metronome: Set it on four beats and set it as fast or as slow as you want. Then get a chord in your mind, say D. When the metronome reaches its last beat, press down the strings. When it happens again, strum it and let it free. Then again. Do this 10 to 20 minutes a day and in less than a week, the chord progression will begin to sound much better.
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