Anastasiak112, when you use the transposing function with Chordie you will still play in open chords. If a song is in the key of E and you wanted to change the key to G you would simply transpose up 3 semi-tones and play an open G chord.. Now, with a capo. if a song is in the key of E and you wanted the key to be in G you have a couple of choices.
Choice #1 - place you capo on the 3rd fret and then make a E chord. This voicing will be in the key of G. In a 1 - 4 - 5 chord progression with the key of the song being in E the open chords would be E - A and B7. Now, with your capo on the 3rd fret when you finger an E chord the voicing will be in G, an A chord will have the voice of C and a B7 chord will have a voice of a D7 chord.
Choice #2 - (hard) use your index finger to form a barre at the 3rd fret. With your middle , ring and pinky fingers form a open E chord. This will be you G voicing. Now while leaving your index finger barring the strings at the 3rd fret, take your ring finger and form another barre on the 5th fret strings 4, 3 and 2. This is a double barre and the voicing is in A. By sliding both your index finger and ring finger down 2 frets this double barre becomes a B chord.
Npw I know this will be hard for you to understand as it was hard for me to explain it. I found a good capo chart on the internet awhile back and I will try to locate that site for you. It is simple to read and it will tell you what you are asking.
Hope this helps.
Nela