Newbie; cannot send sats via lightning

I can send via BTC network, but not lightning. Installed thunder, LDNG, ride and blue wallet.
invoices keeps coming back as invalid.
Cannot take a pic of code, ( browser settings invalid ?)

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Do you know how Lightning Network works?

What partners do you have funded channels with? Is there enough outbound capacity to send what you want to send? A picture would help immensely to troubleshoot if you can get one