Gridbox Package Installation

Hi, I have had an illness which has afected my memory and resourcefulness and am trying to build a new website for a client after a two-year pause in my work.
I have installed Joomla but now trying to upload Gridbox packagethe reult fails with this message:
"Maximum upload size: ‎2.00 MB"
Media manager options indicate:
"Maximum Size 10 (in MB)"
What should I adjust to allow Gridbox to be uploaded?

many thanks

Furthermore (if it's of assistance), I have also found the following messages:

"WarningThe PHP temporary folder is not set.
This folder is the folder that PHP uses to store an uploaded file before Joomla can access this file. Whilst the folder not being set isn't always a problem, if you are having issues with manifest files not being detected or uploaded files not being detected, setting this in your php.ini file might fix the issue.

WarningSmall PHP maximum POST size.
This is the maximum amount of data that can be sent via POST to the server. This includes form submissions for articles, media (images, videos) and extensions. This value is less than 16MB which may impact on uploading large extensions. This is set in the php.ini under post_max_size.

WarningMaximum PHP file upload size is too small.
The maximum file size for uploads is set to less than 16MB which may impact on uploading large extensions. This is set in php.ini in both the upload_max_filesize and post_max_size settings of your PHP settings (located in php.ini and/or .htaccess file). The value of post_max_size must be greater than the value of upload_max_filesize."

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