Transposing chords

that depends on if you want to use open chords or bar chords, transposing down or up is easy if you understand the scales construction if you want or like open chords then a capo will make it easier but say for instance the song is in A you can play an open E form with a capo on the 4th fret the open A form on the 4th fret is a D and the open D is a G I mentioned the cycle of 5ths clockwise its the cycle of 5ths counter clockwise its the cycle of 4ths now if the song is to high to sing lower the capo two frets and an open E form now becomes a G the A form is a C and the D form is an F an easy way to understand it is start with 1st posistion open E then A D G C these are all open chords and also the cycle of 4ths if you start with open C to G D A E that is the cycle of 5ths

To transpose down one step (semitone) using the chordie feature is great but you often end up playing in some potentially quite difficult keys.
For example, if the song was in G, chordie will transpose it into F#, which could prove tricky for some.
The solution (which is echoing what Russell said) is to use chordie to transpose down, and then the capo to get back up to where you want to be.
Example: transpose down 5 on chordie and then capo up 4 frets. Down 5 and up 4 means overall you are down 1.
Why down 5 you ask?
If the original is in C, for example, this puts it into G and keeps the chord shapes fairly simple and open.
The trick is to use chordie to transpose down till you get a key with chord shapes you are happy with. Then, note how many steps down that was, and capo back up one step less.