I know that I can't apply for ILR till 28 days prior to something but is it 28 days prior to my 5 year anniversary of settling in the UK or 28 days prior to my current visa's expiration?
It's 28 days before you reach 5 years in the UK.
I see from your signature that you arrived in the UK on June 7th 2013... so that means you can apply for ILR 28 days before June 7th 2018 - so that's 10th May 2018.
When I try to find the info online I'm told I need to fill in form FLR(M). But is that for ILR? I thought that was the same form I filled in for the visa.
No, FLR(M) is the visa you already have. You are now applying for ILR not FLR.
This is the page you need to be looking at:
https://www.gov.uk/settle-in-the-uk/y/you-re-the-family-member-or-partner-of-a-british-citizen/no/partner/you-re-still-with-your-partnerThe form you need is SET(M), which you can find here:
https://www.gov.uk/government/publications/application-to-settle-in-the-uk-form-setmBasically, though, it's pretty much all the same documents as you provided for FLR(M):
- financial requirement documents
- accommodation evidence
- relationship evidence: 6 official documents in both your names spread over the length of your FLR(M) visa, evenly spaced and from at least 3 different sources, showing you have lived together for the whole time.
You also need to take and pass the Life in the UK test before you apply for ILR:
https://www.gov.uk/life-in-the-uk-test