So I made a support ticket to install the app, and support did it. Now, I'm unable to configure the add-on because of some internal server errors. When I talked to support about this, they responded with this documentation : https://docs.splunk.com/Documentation/SplunkCloud/7.2.6/Service/SplunkCloudservice#Differences_between_Splunk_Cloud_and_Splunk_Enterprise
"Splunk does not support the use of inputs.conf on the search tier of Splunk Cloud. Splunk Cloud uses the Packaging Toolkit (http://dev.splunk.com/view/packaging-toolkit/SP-CAAAE9V#partitioning) to partition apps into appropriate packages for the search tier, indexer tier, and forwarder tier. You are responsible for installing the data collection components of any app you want to use in Splunk Cloud on a Splunk Forwarder under your control. If you require direct input on the search tier and you cannot deploy forwarders, you can request that Splunk Cloud deploy data ingestion processes on the Splunk Cloud search tier, but this approach is not subject to Splunk Cloud SLAs."
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