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Selection (Blueprint)

Set the selected slot: 
Set Selected Slot
   Slot Index = X
Get the current selection: 
Get Selected Slot
→ int32
Check if a given slot is selected: 
Is Slot Selected
   Slot Index = X
   Return     = true/false

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Selection (C++)

HotbarComponent->SetSelectedSlot(DesiredIndex);

int32 Selected = HotbarComponent->GetSelectedSlot();

bool bSelected = HotbarComponent->IsSlotSelected(SomeIndex);

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Responding to Selection Changes

Blueprint Event In HotbarComponent or listening Blueprint: 
Event On Slot Selection Changed
   New Selected Slot = Index
   ↓
Update UI highlight
   ↓
Optionally: Equip weapon / update action
C++ 
HotbarComponent->OnSlotSelectionChanged.AddDynamic(this, &AMyClass::HandleSelectionChanged);

void AMyClass::HandleSelectionChanged(int32 NewSlot)
{
    // Example: update UI and/or equip
    HotbarUI->HighlightSlot(NewSlot);
}

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Scroll Through Hotbar (C++ Example)

void AMyCharacter::ScrollHotbar(float Delta)
{
    int32 CurrentSlot = HotbarComponent->GetSelectedSlot();
    int32 MaxSlots    = HotbarComponent->MaxSlots;

    int32 NewSlot = CurrentSlot;

    if (Delta > 0)
    {
        NewSlot = (CurrentSlot + 1) % MaxSlots;
    }
    else if (Delta < 0)
    {
        NewSlot = (CurrentSlot - 1 + MaxSlots) % MaxSlots;
    }

    HotbarComponent->SetSelectedSlot(NewSlot);
}
In Blueprint you’d mirror this with: 
Get Selected Slot
   ↓
Add/Subtract (based on scroll input)
   ↓
Modulo by MaxSlots
   ↓
Set Selected Slot