Please refer to the following steps to update/upgrade your server resources.
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1. Log into your ControlCentre (http://www.bytehouse.co.uk/controlcentre)
2. In the 'Subscription' drop-down menu, select the relevant server
3. Click 'Buy Resources'
Select the resource type that you need, say, 'SLM memory limit' is the RAM resource.
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In case you have already reached the maximum possible upgrade limit for a particular resource, you will have to upgrade the hosting plan.