Donorbox creates Salesforce campaigns based on the name of your campaign on Donorbox. In order for data on a Donorbox campaign to be routed to a specific campaign in Salesforce, their names must be the same.
You have created a campaign on Donorbox called 'Help Save the Rainforest'. You then create a campaign on Salesforce called 'Help Save the Rainforest'. The data from your 'Help Save the Rainforest' campaign on Donorbox will then be allocated to your 'Help Save the Rainforest' campaign on Salesforce because the two campaigns share a name.
In short, the data from a Donorbox campaign can only be routed to a specific Salesforce campaign if the names are an exact match.