If you try to upload image to your post, and get this "Unable to create directory wp-content/uploads/... Is its parent directory writable by the server?" error message in WordPress, here is how I fix it.
Basically change wp-content file permission to 777, and once you can upload image, change it back to 755.
A video that might help: • Using FileZilla Secure FTP or SFTP Co...
If this somehow still doesn't work, talk to your host.
On this page of the site you can watch the video online Fix Unable to create directory wp-content/uploads WordPress Error with a duration of hours minute second in good quality, which was uploaded by the user Kim - WordPress & Computer Tutorials 28 February 2014, share the link with friends and acquaintances, this video has already been watched 69,405 times on youtube and it was liked by 173 viewers. Enjoy your viewing!