Upgrade Error

Have never run into this before.  I know it is basically giving instructions on what do do but I have no clue how to do it.  How do I check if those folders are writable?

Quote

Package upload failed due to the following error:
"Although the package w...

Source: http://www.simplemachines.org/community/index.php?topic=453575.msg3168725#msg3168725

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