Partition Sizes

How do I change the partition sizes on a RAQ4

just done an OS rebuild and got

Filesystem Size Used Avail Use% Mounted
/dev/md1 726M 544M 182M 75% /
/dev/md3 194M 8.7M 185M 4% /var
/dev/md4 4.5G 89M 4.4G 2% /home

want my /home to be the rest of the disk

Thanks

 

 

 

 

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