abort: unsynced remote changes?

I got a warning like this

abort: unsynced remote changes!

How do I 1) See what's the difference? hg diff? hg status? 2) Harmonize the code?

Thanks in advance. Here's what I got running hg inspecting the heads

$ hg heads
ändring:     192:e571b17295e9
märke:       tip
förälder:    175:f50d4c4461e5
användare:   tekniklas
datum:       Sat Jan 08 04:45:07 2011 +0000
kortfa开发者_C百科ttat:  twitter support added

ändring:     191:9e419ce3e7e1
användare:   tekniklas
datum:       Wed Mar 09 12:56:27 2011 +0000
kortfattat:  adsense maps

ändring:     159:f8d974793b12
förälder:    157:ef1d955b9236
användare:   tekniklas
datum:       Sat Dec 18 17:05:45 2010 +0000
kortfattat:  remove

ändring:     89:008a2ac46b4f
användare:   tekniklas
datum:       Sun Aug 01 07:10:40 2010 +0000
kortfattat:  classifiedsmarket/market/market_ad_preview.html

ubuntu@ubuntu:/media/Lexar/montao$ 

You have to pull latest changes before pushing:

hg pull

To view differences before pull:

hg in

After pull you have to merge changes you've pulled with the changes you're trying to push:

hg merge

After merge you'll have to commit your merge:

hg commit

And finally push without errors:

hg push

Just do a

hg incoming

You will see the list of changes that are available in the remote side