Yes, to view the template forums, you need to be a current member.
From the TOS
During the membership term, full access will be provided to the templates and the forums. After membership has expired, download access is removed, and forum access is limited, entitlement rights continue however.
This was the info Kat05 was referring to.
As this is not template related, you may want to search or post on joomla.ofg.
JEM wrote:
The params.ini unwritable issue is a 'Joomla thing' even if you set it to writable and make changes, as are still able to make changes, it sometimes shows unwritable.
There are a few reasons for this, one of them is not having the Joomla FTP layer set properly.
Many users skip this step during the install.
If it's not an issue, i.e., the changes save and your site appears properly, it's nothing to worry about.
If you want to troubleshoot it, you can search joomla.org for 'params.ini unwritable'