Welcome to vfx then 
If you haven’t checked it out yet, take a look at this thread, there’s some good tutorials linked there:
So, here are some images hopefully answering your question:
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Create new Particle Attribute
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Either in Particle Spawn or in Particle Update hit the ‘+’ to add a new module and go on ‘Set new or existing parameter directly’
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Select the module and set it to the value you like
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Win!
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