Updating

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Hi
I am trying to update to the latest version of concete 5 which is installed in safe mode. When i try to update it just says to make sure my drive is writable. How do you alter the permissions?. Also i have another probelm that when i update my blog the date does not change which is affecting my google position as it shows it has not been updated since April, which is incorrect. I would be grateful for any help!!

Thanks

Kieran